Motor having limited lead-end shaft access

ABSTRACT

A motor includes a shaft presenting a shaft lead end, a switch assembly including a switch arm shiftable between a first position and a second position, and shield structure. The shaft lead end and the switch assembly are disposed axially outward of an endshield. The shield structure is disposed axially outward of the switch arm to at least substantially restrict direct tool access to the switch arm from an axially outward position relative to the switch arm. The shield structure at least in part defines first and second tool access channels each extending radially inwardly to the shaft lead end, such that the shield structure enables direct tool access to the shaft lead end via the tool access channels but prevents or at least substantially restricts direct tool access to the switch arm via the tool access channels.

CROSS-REFERENCE TO RELATED APPLICATIONS

1. Priority Applications

The present application claims priority from U.S. Provisional PatentApplication No. 62/411,367, filed Oct. 21, 2016, and entitled MOTORHAVING LIMITED LEAD-END SHAFT ACCESS, the entire disclosure of which ishereby incorporated by reference herein.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The present invention relates generally to an electric motor including aswitch assembly.

2. Discussion of the Prior Art

Those of ordinary skill in the art will appreciate that conventionalelectric motors may include a switch assembly associated with control ofone or more aspects of motor operation. Such motors may also include ashaft having axially opposed ends. One of the shaft ends may beassociated with an output mechanism or assembly, such as a pump. Tosecure the output mechanism relative to the shaft, it is often necessaryto access the shaft end opposite the mechanism (e.g., by a wrench,screwdriver, or other tool). More particularly, the opposite end of theshaft is often engaged in such a manner as to be held at leastsubstantially stationary during installation or removal of the outputmechanism or assembly. Alternatively, some degree of rotation (e.g., ina direction counter to that of the output mechanism or assembly duringinstallation or removal) might be imparted on the opposite end of theshaft by the tool. Furthermore, the shaft end opposite the outputmechanism is often associated with the motor controller and associatedcomponents, such as the switch assembly. Inadvertent contact with theswitch assembly (e.g., by the tool) during such an access process isundesirable.

SUMMARY

According to one aspect of the present invention, a motor is provided.The motor comprises a rotor, a switch assembly, a lead-end endshield,and shield structure. The rotor is rotatable about an axis. The rotorincludes a shaft presenting a shaft lead end. The switch assembly isoperable to at least in part control an aspect of motor operation. Theswitch assembly includes a switch arm shiftable between a first positionand a second position. The endshield presents opposite inner and outerendshield sides. The shaft projects through the endshield. The shaftlead end and the switch assembly are disposed axially outward of theouter endshield side. The shield structure is disposed axially outwardof the switch arm to at least substantially restrict direct tool accessto the switch arm from an axially outward position relative to theswitch arm. The shield structure further at least in part defines a toolaccess channel extending radially inwardly to the shaft lead end, suchthat the shield structure enables direct tool access to the shaft leadend via the tool access channel. The shaft lead end is at least in partdisposed between the tool access channel and the switch arm, such thatthe shaft lead end at least substantially restricts direct tool accessto the switch arm via the tool access channel.

According to another aspect of the present invention, a motor isprovided. The motor comprises a rotor, a switch assembly, a lead-endendshield, and shield structure. The rotor is rotatable about an axis.The rotor includes a shaft presenting a shaft lead end. The switchassembly is operable to at least in part control an aspect of motoroperation. The switch assembly includes a switch arm shiftable between afirst position and a second position. The endshield presents oppositeinner and outer endshield sides. The shaft projects through theendshield. The shaft lead end and the switch assembly are disposedaxially outward of the outer endshield side. The shield structure isdisposed axially outward of the switch arm to at least substantiallyrestrict direct tool access to the switch arm from an axially outwardposition relative to the switch arm. The shield structure further atleast in part defines a tool access channel extending inwardly to theshaft lead end in a first generally radial direction, such that theshield structure enables direct tool access to the shaft lead end viathe tool access channel. The switch arm is spaced radially outward ofthe shaft in a second generally radial direction non-opposite the firstgenerally radial direction. The second generally radial direction isangularly spaced from the first generally radial direction by an offsetangle such that the shield structure at least substantially restrictsdirect tool access to the switch arm via the tool access channel.

This summary is provided to introduce a selection of concepts in asimplified form. These concepts are further described below in thedetailed description of the preferred embodiments. This summary is notintended to identify key features or essential features of the claimedsubject matter, nor is it intended to be used to limit the scope of theclaimed subject matter.

Various other aspects and advantages of the present invention will beapparent from the following detailed description of the preferredembodiments and the accompanying drawing figures.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

Preferred embodiments of the present invention are described in detailbelow with reference to the attached drawing figures, wherein:

FIG. 1 is a pump-end (or front) perspective view of a motor according toa preferred embodiment of the present invention;

FIG. 2 is a lead-end (or rear) perspective view of the motor of FIG. 1;

FIG. 3 is an enlarged, partially sectioned side perspective view of themotor of FIGS. 1 and 2, particularly illustrating the rotor and stator;

FIG. 4 is an enlarged, partially sectioned perspective view of the leadend of the motor of FIGS. 1-3 with the cover removed, particularlyillustrating the lead-end endshield, the capacitor, the terminal boardassembly, and the start switch assembly in a lowered position;

FIG. 5 is an enlarged, partially sectioned perspective view of the leadend of the motor of FIGS. 1-4, largely similar to that of FIG. 4, butparticularly illustrating the lead-end endshield, the capacitor, theterminal board assembly, and the start switch assembly in a raisedposition;

FIG. 6 is an enlarged, partially sectioned perspective view of the leadend of the motor of FIGS. 1-4, from a vantage point largely oppositethat of FIGS. 4 and 5, particularly illustrating the structuralshielding of the switch arm of the switch assembly;

FIG. 7 is an exploded perspective view of the lead end of the motor ofFIGS. 1-6;

FIG. 8 is a greatly enlarged perspective view of the interface betweenthe terminal board assembly and the capacitor of the motor of FIGS. 1-7;

FIG. 9 is a greatly enlarged, partially sectioned elevational view ofthe interface between the terminal board assembly and the capacitor ofthe motor of FIGS. 1-8;

FIG. 10 is a partially exploded perspective view of the lead end of themotor of the motor of FIGS. 1-9, particularly illustrating a first toolaccess channel to the shaft;

FIG. 11 is a partially exploded perspective view of the lead end of themotor of FIGS. 1-10, from a vantage point largely opposite that of FIG.10, particularly illustrating the first tool access channel to theshaft;

FIG. 12 is a perspective view of the lead end of the motor of FIGS.1-11, particularly illustrating a wrench accessing the shaft via thefirst tool access channel;

FIG. 13 is a perspective view of the lead end of the motor of FIGS.1-12, particularly illustrating a second tool access channel to theshaft;

FIG. 14 is a perspective view of the lead end of the motor of FIGS.1-13, particularly illustrating a screwdriver accessing the shaft viathe second tool access channel;

FIG. 15 is a perspective view of the lead-end endshield of the motor ofFIGS. 1-14;

FIG. 16 is a perspective view of the lead-end endshield of the motor ofFIGS. 1-14, from a vantage point largely opposite that of FIG. 15;

FIG. 17 is a front perspective view of the capacitor of the motor ofFIGS. 1-14;

FIG. 18 is a rear perspective view of the capacitor of FIG. 17;

FIG. 19 is a front view of the capacitor of FIGS. 17 and 18;

FIG. 20 is a side elevational view of the capacitor of FIGS. 17-19;

FIG. 21 is an enlarged, top perspective view of the terminal boardassembly of the motor of FIGS. 1-14;

FIG. 22 is a bottom perspective view of the terminal board assembly ofFIG. 21;

FIG. 23 is a side elevational view of the terminal board assembly ofFIGS. 21 and 22;

FIG. 24 is an inner, top perspective view of the switch portion of theswitch assembly of the motor of FIGS. 1-14;

FIG. 25 is an inner, bottom perspective view of the switch portion ofFIG. 24;

FIG. 26 an outer, top perspective view of the switch portion of FIGS. 24and 25;

FIG. 27 is an outer, bottom perspective view of the switch portion ofFIGS. 24-26;

FIG. 28 is a lead-end (or rear) view of the motor of FIGS. 1-14, withthe cover removed, and particularly illustrating a wrench accessing theshaft via the first tool access channel;

FIG. 29 is a lead-end (or rear) view of the motor of FIGS. 1-14 and 28,with the cover removed, and particularly illustrating a screwdriveraccessing the shaft via the second tool access channel; and

FIG. 30 is a lead-end (or rear) view of the motor of FIGS. 1-14, 28, and29, with the cover removed, and particularly illustrating the relativeangular dispositions of the switch arm (at the actuating end thereof)and the first and second tool access channels.

The drawing figures do not limit the present invention to the specificembodiments disclosed and described herein. The drawings are notnecessarily to scale, emphasis instead being placed upon clearlyillustrating the principles of the preferred embodiments.

Furthermore, directional references (e.g., top, bottom, front, back,side, etc.) are used herein solely for the sake of convenience andshould be understood only in relation to each other. For instance, acomponent might in practice be oriented such that faces referred to as“top” and “bottom” are sideways, angled, inverted, etc. relative to thechosen frame of reference.

It is also noted that, as used herein, the terms axial, axially, andvariations thereof mean the defined element has at least somedirectional component along or parallel to the axis. These terms shouldnot be limited to mean that the element extends only or purely along orparallel to the axis. For example, the element may be oriented at aforty-five degree (45) angle relative to the axis but, because theelement extends at least in part along the axis, it should still beconsidered axial. Similarly, the terms radial, radially, and variationsthereof shall be interpreted to mean the element has at least somedirectional component in the radial direction relative to the axis.

It is further noted that the term annular shall be interpreted to meanthat the referenced object extends around a central opening so as to begenerally toroidal or ring-shaped. It is not necessary for the object tobe circular, nor does the object have to be continuous. Similarly, theterm toroidal shall not be interpreted to mean that the object must becircular or continuous.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The present invention is susceptible of embodiment in many differentforms. While the drawings illustrate, and the specification describes,certain preferred embodiments of the invention, it is to be understoodthat such disclosure is by way of example only. There is no intent tolimit the principles of the present invention to the particulardisclosed embodiments.

Overview

In a preferred embodiment, an electric motor 10 is provided. The motor10 is preferably a pump motor. More particularly, the motor 10 ispreferably for use in applications requiring or potentially subject toexposure to dust, moisture, or other environmental contaminants. Forinstance, the motor 10 might suitably be a pool pump motor configuredfor assembly with a filter pump for circulating and filtering water ofbody of water such as an above-ground swimming pool. However, otherapplications, including those not associated with a pump, arepermissible according to some aspects of the present invention.

The motor 10 preferably includes a stator 12 and rotor 14 rotatableabout an axis. In a preferred embodiment, as shown, the stator 12 atleast substantially circumscribes the rotor 14, such that the motor 10is an inner rotor motor. It is permissible according to some aspects ofthe present invention, however, for the motor to be an outer rotor motoror a dual rotor motor.

The stator 12 preferably includes a stator core 16 and a plurality ofcoils 18 (shown schematically) wound about the core 16. The coils 18preferably comprise electrically conductive wiring 20.

The rotor 14 preferably includes a rotor core (not shown), a pluralityof magnets (not shown) and a shaft assembly 22 defining a rotationalaxis for the rotor 14.

The motor 10 further preferably includes a housing 24. The housing 24preferably includes a shell 26, a lead-end endshield 28, and a pump-endendshield 30. The shell 26 and the lead-end and pump-end endshields 28and 30, respectively, preferably present a motor chamber 32 that atleast substantially receives the stator 12 and the rotor 14.

In a preferred embodiment, the shell 26 extends generallycircumferentially about the stator 12. It is permissible according tosome aspects of the present invention, however, for the shell to extendin such a manner as to provide one or more flat sides, in contrast tothe preferred generally cylindrical form, or to be otherwisealternatively shaped.

The shell 26 preferably extends generally continuously and is devoid ofapertures. However, it is permissible according to some aspects of thepresent invention for the shell to include openings or slotstherethrough. For instance, openings or slots may be provided forventilation and/or access purposes.

The lead-end and pump-end endshields 28 and 30 preferably supportrespective lead-end and pump-end bearing assemblies 34 and 36 thatrotatably support the shaft assembly 22. Alternative or additionalbearing assembly supports or shaft assembly supports may be providedwithout departing from the scope of the present invention, however.

The lead-end and pump-end endshields 28 and 30 are preferably fixedrelative to the shell 26 by any means known in the art, including butnot limited to discrete fasteners, contact/friction, integral formation,latches, adhesives, welding, etc.

In a preferred embodiment, as illustrated, the pump-end endshield 30 isat least substantially solid in construction, such that ingress ofcontaminants therethrough is at least generally prohibited. The lead-endendshield 28, however, preferably includes ventilation structure 38,which will be discussed in greater detail below, therein. However,alternative configurations fall within the scope of the presentinvention.

Furthermore, although the illustrated lead-end endshield 28 and pump-endendshield 30 are generally circular in cross-sectional shape,alternative shapes (e.g., square, oval, etc.) are permissible.

With continued regard to the lead-end endshield 28, the lead-endendshield 28 preferably broadly includes a base plate 40,capacitor-mounting structure 42, wire-routing structure 44, and theaforementioned ventilation structure 38.

The housing 24 further preferably includes a cover 46 that cooperateswith the lead-end endshield 28 to define an electrical component chamberor electronics compartment 48 for at least substantially enclosingvarious structures 49 (both electrical and non-electrical) that will bedescribed in greater detail below. A cover at least substantiallysimilar to the cover 46 is disclosed in U.S. Pat. No. 6,831,382 to Lyleet al., issued Dec. 14, 2004, entitled COVER FOR ELECTRIC MOTOR, theentire disclosure of which is hereby incorporated by reference herein.Most preferably, the cover 46 is removably fixed relative to thelead-end endshield 28.

It is particularly noted that various modifications to the illustratedcover design are permissible without departing from the scope of thepresent invention. Among other things, for instance, the cover mightinclude a plurality of reinforcement ribs along either or both of an endface and sidewall thereof.

The lead-end endshield 28 preferably presents opposite inner and outerendshield sides 28 a and 28 b. The inner side 28 a at least in partdefines the motor chamber 32; the outer side 28 b at least in partdefines the electronics compartment 48.

The motor 10 further preferably includes mounting structure 50 forcoupling the motor 10 and a pump (not shown). More particularly, themounting structure 50 preferably includes a plurality of bosses 52defining fastener-receiving holes 54 through which fasteners (not shown)might pass to secure the pump and the motor 10 to each other.

Capacitor Mounting Structure

As noted previously, the electronics compartment 48 preferably houses avariety of structures 49. Such structures 49 preferably include acapacitor 56, a switch assembly 58, a terminal board assembly 60, andwire-routing structures 44. However, alternative or additionalcomponents, as well as fewer components, might be provided as part ofsaid “structures” without departing from some aspects of the presentinvention. For instance, the switch assembly might be of an alternativetype, additional wire-routing structure might be provided, or controlcircuitry might be present. Such alternatives will be discussed ingreater detail below.

The motor 10 is preferably a capacitor-start motor. The capacitor 56 maybe of any type known in the art without departing from some aspects ofthe present invention. The illustrated capacitor, however, is a startcapacitor that presents a generally cylindrical body 64 having axiallyspaced apart terminal and other ends 66 and 68. The body 64 alsopresents a curved outer surface 70 that includes axially opposed innerand outer surfaces 70 a and 70 b, respectively.

The capacitor 56 is preferably mounted to the lead-end endshield 28. Forinstance, in a preferred embodiment, the lead-end endshield 28 presentsa pair of arcuately spaced apart capacitor support columns 72 and 74, aswell as a capacitor boss 76. The capacitor support columns 72 and 74each preferably include a respective generally axially projecting base78 or 80 and a generally axially projecting retention wall 82 or 84projecting from the base 78 or 80. Each capacitor support column 72 and74 also preferably defines a respective shelf 86 or 88 adjacent thecorresponding retention wall 82 or 84. More particularly, each base 78or 80 preferably presents a face 90 or 92 that defines the correspondingshelf 86 or 88 and from which the retention wall 82 or 84 projects.

Each face 90 and 92 and, in turn, each shelf 86 and 88, is preferably atleast substantially smooth, although irregularities are permissibleaccording to some aspects of the present invention. Furthermore, eachface 90 and 92 and associated shelf 86 and 88 preferably angles orslopes downwardly and inwardly toward the other of the shelves 86 and 88or faces 90 and 92. That is, the shelf 86 presents an upper margin 86 aand a lower margin 86 b, with the lower margin 86 b being arcuatelynearer the other capacitor support column 74 and shelf 88 than is theupper margin 86 a. Likewise, the shelf 88 presents an upper margin 88 aand a lower margin 88 b, with the lower margin 88 b being arcuatelynearer the other capacitor support column 72 and shelf 86 than is theupper margin 88 a. Alternatively stated, the lower margins 86 b and 88 bare adjacent one another (but preferably not abutting one another),while the upper margins 86 a and 88 a are non-adjacent, with the shelves86 and 88 being disposed arcuately between the upper margins 86 a and 88a.

It is particularly noted that such beveled or angular disposition of theshelves 86 and 88 axially downwardly and toward one another isparticularly suitable for support of a cylindrically bodied capacitor56, as is preferred. However, in alternative embodiments, the shelvesmight be alternatively oriented to better support an alternativelyshaped capacitor. Yet further, although not preferred, alternativeorientations might be present even with a capacitor shaped as shown. Forinstance, shelves that extend generally orthogonally relative to therotor axis might nonetheless support a generally cylindrical capacitor.

Preferably, the capacitor 56 is oriented to extend generally radiallyrelative the motor axis. That is, in a preferred embodiment, theterminal end 66 is positioned radially outwardly relative to the otherend 68. It is permissible, however for the capacitor to be alternativelyoriented (preferably in conjunction with alternative positioning of thecapacitor support columns).

In a preferred embodiment, the terminal end 66 rests on the shelves 86and 88 and presents a terminal end face 94 that abuts the retainingwalls 82 and 84. Additionally, it is preferred that the outer surface 70of the body 64 at the terminal end 66 rests on the shelves 86 and 88. Itis permissible according to some aspects of the invention, however, forthe other end to rest on the shelves and/or abut the retaining walls.Furthermore, it is permissible according to some aspects of the presentinvention for the adjacent one of the capacitor ends to be spaced fromthe retaining walls. That is, in a preferred orientation, the terminalend of the capacitor might be adjacent but not abut the retaining walls,without departing from the scope of the present invention.

Furthermore, it is permissible according to some aspects of the presentinvention for the other end to be adjacent the retaining walls, ratherthan the terminal end.

The capacitor boss 76 is preferably disposed radially inwardly of andarcuately outwardly from (i.e., not in between) the capacitor supportcolumns 72 and 74, although alternative positioning is permissibleaccording to some aspects of the present invention.

The capacitor boss 76 preferably defines a fastener-receiving hole 96. Aclamp 98 and a fastener 100 are also provided. The clamp 98 preferablydefines a fastener aperture 102. The clamp 98 preferably in partcircumscribes the capacitor 56 and is secured to the capacitor boss 76by means of the fastener 100, which extends through the fasteneraperture 102 and into the fastener-receiving hole 96. More particularly,the clamp 98 preferably extends generally semicircularly aboutapproximately half the circumference of the capacitor 56. The clamp 98is preferably disposed adjacent the terminal end 66, althoughalternative positioning along the cylindrical body 64 is permissible.The clamp 98 preferably functions to additionally secure the capacitor56 on the shelves 86 and 88.

In a preferred embodiment, the capacitor support columns 72 and 74, aswell as the capacitor boss 76, are integrally formed with the lead-endendshield 28. Discrete formation of one or more of these components ispermissible according to some aspects of the present invention, however,with relative securement between such discrete component or componentsand the lead-end endshield being by any means known in the art (e.g.,welding, adhesives, fasteners, latches, etc.).

Terminal Board Assembly

As noted previously, the electronics compartment 48 additionally housesa terminal board assembly 60. Broadly speaking, the terminal boardassembly 60 is configured to engage wiring (not shown) associated withthe motor 10. Potential functions of the terminal board assembly 60 willbe readily apparent to those of ordinary skill in the art and will notbe discussed in detail herein.

Preferably, the terminal board assembly 60 includes a wiring portion104, a voltage portion 106, and a capacitor portion 108.

In a broad sense, the wiring portion 104 preferably includes wireconnection structure 110 consistent with the performance and operationalneeds of the motor 10. More particularly, the wiring portion 104preferably includes four sides 112 a,112 b,112 c,112 d disposedgenerally orthogonally relative to one another to form a substantiallyrectangular shape. The wiring portion 104 also preferably includes a top114 extending between and connecting the sides 112 a,112 b,112 c,112 d.The wire-connection structure 110 is preferably disposed on the top 114,which includes corresponding recesses 116 for receiving such structure110.

Preferably, the side 112 c is axially taller than the side 112 a, suchthat the top 114 slopes downwardly from side 112 c to 112 a to connectstructure 110 with greater top-down visibility.

The wiring portion 104 also preferably includes a shield 118 extendingcontinuously (and, preferably, integrally) from the side 112 d, upwardlyin a generally axial direction relative to the top 114. The shield 118preferably provides a physical barrier between the wire connectionstructure 110 (and wiring associated therewith) and the capacitor 56(more particularly, the other end 68 thereof).

The voltage portion 106 preferably includes sides 120 a,120 b,120 c,120d so as to be generally rectangular in form and define an opening 122for a voltage change switch (not shown). Such portion and switch may beomitted without departing from the scope of the present invention,however, or the portion may be alternatively shaped.

Preferably, the voltage portion 106 is disposed adjacent side 112 a ofthe wiring portion 104, although alternative positioning is permissibleaccording to some aspects of the present invention.

A first mounting tab 126 preferably extends from the side 112 b of thewiring portion 104, while a second mounting tab 128 preferably extendsfrom the side 120 a of the voltage portion 106. Fasteners 130 and 132preferably extend through respective ones of the tabs 126 and 128 intorespective apertures 134 and 136 in the lead-end endshield 28 to fix theterminal board assembly 60 to the lead-end endshield 28. Alternative oradditional fastening means, including but not limited to welding,adhesives, or latches, may additionally or alternatively be used,however. Furthermore, more or fewer fasteners and/or tabs might beprovided, and/or the tabs might be alternatively positioned. Yetfurther, integral formation of the terminal board assembly with thelead-end endshield 28 is also permissible according to some aspects ofthe present invention.

In a preferred embodiment, as illustrated, the capacitor portion 108includes a top plate 138 extending in a plane generally orthogonal tothe motor axis; a sidewall 140 extending axially downwardly from andorthogonally relative to the top plate 138 to interconnect the top plate138 with the side 120 d of the voltage portion 106; and a pair ofbrackets 142 and 144 extending generally downwardly from andorthogonally relative to the top plate 138.

Furthermore, the top plate 138 and the brackets 142 and 144 also extendgenerally radially inwardly relative to the voltage portion 106 and thewiring portion 104. More particularly, the top plate 138 preferablyextends directly from the shield 118 of the wiring portion 104, whilethe brackets 142 and 144 extend directly from the side 112 d of thewiring portion 104.

Preferably, the top plate 138 includes a cutout 146 sized and shaped toreceive the other end 68 of the capacitor 56. More particularly, thecutout 146 preferably presents a side edge 148 that extends alongsidethe outer surface 70 of the capacitor body 64 adjacent and radiallyoutwardly from the other end 68. The side edge 148 is preferablyslightly spaced from the outer surface 70 but may engage it withoutdeparting from some aspects of the present invention.

The cutout 146 also preferably presents a back edge 150 that extendsalongside an end face 152 of the other end 68 of the capacitor body 64.The back edge 150 is preferably slightly spaced from the end face 152but may engage it without departing from some aspects of the presentinvention.

In addition to the end face 152, the other end 68 of the capacitor body64 preferably includes a recess or well 154 adjacent the end face 152.The well 154 is preferably in the form of an arched door and is definedby a back wall 156, a pair of spaced apart sides 158 and 160 orientedgenerally orthogonally to the back wall 156, and an arched roof 162interconnecting the sides 158 and 160 and also extending generallyorthogonally from the back wall 156.

Preferably, the back wall 156, the end face 152, and the back edge 150each extend generally parallel to one another, although such anarrangement is not essential to some aspects of the present invention.

Preferably, the other end 68 of the capacitor 56 also presents agenerally curved transition face 166 extending between andinterconnecting the end face 152 with the outer surface 80 of the body64. Preferably, the transition face 166 extends in the form of an arch,in keeping with the preferred extension of the end face 152. Alternativeshapes or extents are permissible according to some aspects of thepresent invention, however.

In a preferred embodiment, each of the brackets 142 and 144 includes apositioner 168 or 170 extending generally orthogonally relative to theback edge 150. Each bracket 142 or 144 also includes a respectivesupport component 172 or 174 extending from the corresponding one of thepositioners 168 or 170, also generally orthogonally relative to the backedge 150. The positioner 168 preferably presents a front face 176 andspaced apart inner and outer faces 178 and 180, respectively. Similarly,the positioner 170 preferably presents a front face 182 and spaced apartinner and outer faces 184 and 186, respectively.

The brackets 142 and 144 (or, more particularly, the positioners 168 and170) are preferably disposed such that back edge 150 of the capacitor 56abuts each of the front faces 176 and 182. Thus, a gap 188 is formedbetween the inner faces 178 and 184, the back wall 156, and the backedge 150. Furthermore, the brackets 142 and 144 (or, more particularly,the positioners 168 and 170) are preferably disposed such that the outerfaces 180 and 186 each engage or nearly engage respective ones of thesides 158 and 160 that in part define the capacitor well 154. Thus, thepositioners 168 and 170 aid in locating the capacitor 56 laterallyrelative to the terminal plate assembly 60.

The support components 172 and 174 of the brackets 142 and 144 arepreferably configured to support the other end 68 of the capacitor 56.That is, the support components 172 and 174 of the brackets 142 and 144preferably cooperate primarily with the capacitor support columns 72 and74 to support the capacitor 56. More particularly, in a preferredembodiment, each support component 172 or 174 presents a face 190 or 192that defines a corresponding shelf 194 or 196. The other end 68 of thecapacitor 56 rests on the shelves 194 and 196.

Each face 190 and 192 and, in turn, each shelf 194 and 196, ispreferably at least substantially smooth, although irregularities arepermissible according to some aspects of the present invention.Furthermore, each face 190 and 192 and associated shelf 194 and 196preferably angles or slopes downwardly and inwardly toward the other ofthe shelves 194 and 196 or faces 190 and 192. That is, the shelf 194preferably presents an upper margin 194 a and a lower margin 194 b, withthe lower margin 194 b being arcuately nearer the other supportcomponent 174 and shelf 196 than is the upper margin 194 a. Likewise,the shelf 196 preferably presents an upper margin 196 a and a lowermargin 196 b, with the lower margin 196 b being arcuately nearer theother support component 172 and shelf 194 than is the upper margin 196a. Alternatively stated, the lower margins 194 b and 196 b arepreferably adjacent one another (but preferably not abutting oneanother), while the upper margins 194 a and 196 a are preferablynon-adjacent, with the shelves 194 and 196 being disposed arcuatelybetween the upper margins 194 a and 196 a.

It is particularly noted that such beveled or angular disposition of theshelves 194 and 196 axially downwardly and toward one another isparticularly suitable for support of a cylindrically bodied capacitor56, as is preferred. However, in alternative embodiments, the shelvesmight be alternatively oriented to better support an alternativelyshaped capacitor. Yet further, although not preferred, alternativeorientations might be present even with a capacitor shaped as shown. Forinstance, shelves that are generally orthogonally extending relative tothe axis might nonetheless support a generally cylindrical capacitor.

As will be discussed in greater detail below, each support component 172and 174 also preferably extends downwardly (i.e., axially inwardly)toward the base plate 40 of the lead-end endshield 28. For instance, thesupport component 172 preferably extends in such a manner as to form agenerally rectangular barrier wall 198. The support component 174, incontrast, preferably extends in such a manner as to form a generallytriangular barrier wall 200.

Start Switch Assembly

As noted previously, the motor 10 preferably includes the switchassembly 58. Preferably, in keeping with the preferred start capacitorembodiment, the switch assembly 58 is a start switch assembly 58. Atleast some principles of the present invention apply to other types oralternatively functioning switches, however.

Preferably, the switch assembly 58 is responsive to a rotationalcharacteristic of a shaft 206 of the motor shaft assembly 22. In thepreferred switch assembly 58, for instance, switching occurs when therotor 14 (or, more specifically, the shaft 206) is rotating at asufficient speed. More particularly, in a preferred embodiment, theswitch assembly 58 is preferably engaged and the capacitor 56 and anassociated auxiliary winding (not shown) are active while the motor 10is accelerating from stationary to a predefined speed (preferably apercentage of full operational speed). The switch assembly 58 preferablydisengages and thereby switches off the capacitor 56 and the auxiliarywinding when the predefined speed has been achieved. It is permissibleaccording to some aspects of the present invention, however, for analternatively functioning switch (which may not even be associated withthe capacitor) to be provided without departing from the scope of thepresent invention. For instance, the switch might be oppositelyconfigured, such that the capacitor is operable when the switch isdisengaged but shuts off when the switch engages.

In a preferred embodiment, the switch assembly 58 is a centrifugalswitch. However, alternative switch types (e.g., speed, pressure,push-button, toggle, joystick, lever-actuator, selector, fluid-based,etc.) might be used without departing from the scope of the presentinvention

Preferably, the switch assembly 58 includes a switch portion 202 and anactuating portion 204. The switch portion 202 preferably includes asupport body 208 and a switch arm 210 shiftable between axially outer(or upper) and axially inner (or lower) positions.

The support body 208 is preferably fixed to the lead-end endshield 28.Most preferably, the support body 208 is fixed to bosses 208 a and 208b, which are integrally formed with the lead-end endshield 28, byfasteners 209 a and 209 b, respectively. Alternative fixation means arepermissible, however, and include but are not limited to adhesives,welding, integral formation, latches, alternative or additionalfasteners, etc.

The switch arm 210 preferably includes a radially inwardly disposed ordistal actuating end 212 and a radially outwardly disposed or proximalopposite end 214. The switch arm 210 is pivotable about the opposite end214. A shiftable contact is preferably mounted on the arm 210 betweenthe actuating end 212 and the opposite end 214. The actuating end ispreferably configured for engagement with the actuating portion 204, aswill be discussed in greater detail below. The shiftable contact ispreferably configured for engagement with a stationary contact operablyconnected to the capacitor 56 (e.g., by means of wiring, not shown),such that disruption of the circuit disengages the capacitor andauxiliary winding.

In a preferred embodiment, as illustrated, the actuating portion 204includes a disc 220, a pair of weights 222, and a pair of springs 223each extending between and interconnecting the weights 222.

Radially outward pivoting or shifting of the weights 222 in response torotation of the shaft 206 (i.e., pivoting or shifting of the weights 222due to centrifugal force) preferably results in axial shifting of thedisc 220. In the illustrated embodiment, such axial shifting is axiallyinward (i.e., downward). However, the actuating portion may beconfigured in any manner known in the art without departing from thescope of some aspects of the present invention. For instance, axiallyoutward shifting might occur in response to sufficiently rapid shaftrotation and/or a broadly disparate design (e.g., one utilizingalternatively configured or moveable weights, being driven primarily bynon-centrifugal forces, etc.) might be used.

With further regard to the preferred embodiment, the actuating end 212of the switch arm 210 preferably rests on the disc 220. When the motor10 is at rest, the weights 222 are preferably disposed in a radiallyinward position. The disc 220 and the switch arm 210 are in an axiallyoutward (or upper) position. When the motor 10 is initially turned on,the switch arm 210 completes a circuit (not shown) such that thecapacitor 56 and the auxiliary winding are engaged. Engagement of thecapacitor preferably facilitates a quick start-up of the motor 10. Asthe motor shaft 206 accelerates, the weights 222 pivot radiallyoutwardly due to centrifugal force. When the motor 10 has achieved theaforementioned predetermined speed, radially outward shifting of theweights 222 will have preferably resulted in or triggered a discreteaxially inward (downward) shift of the disc 220 and, in turn, of theactuating end 212 of the switch arm 210. The switch assembly 58 ispreferably configured such that this shift will break or disrupt thecapacitor and auxiliary winding circuit (not shown) and thus disengagethe capacitor 56 and the auxiliary winding. That is, the shiftablecontact and the stationary contact preferably disengage upon the inwardshift, such that the capacitor 56 no longer contributes to operation ofthe motor 10.

It is particularly noted that, while suitable configurations of wiring,contacts, etc. associated with the necessary circuitry for operation ofthe switch assembly are not shown and/or described in detail herein,such configurations and details thereof will be readily apparent to oneof ordinary skill and the art and may additionally be modified to suitthe particular application.

Furthermore, it will be readily understood by those of ordinary skill inthe art that any of a variety of “triggering mechanisms” to implementthe above-described axially inward shift of the actuating disc may beemployed without departing from the scope of the present invention. Forinstance, the disc might slip or shift from a resting position on afirst stop to a resting position on a second stop, or a single stop onwhich the disc rests might itself shift from one position to another.

It is also reiterated that many other structural and/or operationalfeatures associated with the switch might vary without departing fromthe scope of some aspects of the present invention. For instance, amongother things, the shiftable contact of the switch arm might instead beinitially spaced from a corresponding stationary contact, only toconnect a circuit upon axially inward shifting of the actuating disc(i.e., the capacitor might be switched off upon completion of anassociated circuit, rather than disconnection thereof, by means of theswitch); the switch might both complete and disrupt disparate circuitssimultaneously; or the actuating disc might shift axially outwardlyrather than inwardly in response to radially outward shifting of theweights.

It is also again particularly noted that any of a variety of switchtypes might be used without departing from the scope of some aspects ofthe present invention, with such designs including both alternatecentrifugal switch designs and entirely different designs (e.g., designsbased on electronic speed sensing).

Additional Features of Lead-End Endshield and Cover

The lead-end endshield 28 preferably presents several other features inaddition to those discussed above. In a preferred embodiment, forinstance, the lead-end endshield 28 includes a pair offastener-receiving posts 224 and 226. Fasteners 228 and 230 preferablyextend through the cover 46 and into respective ones of the posts 224and 226 to secure the cover 46 to the lead-end endshield 28.

A plurality of fastener recesses 232 and associated openings 234 arealso preferably defined by the lead-end endshield 28 adjacent an outercircumferential margin 236 thereof. Fasteners 238 preferably extendthrough the openings 234, through corresponding openings 240 in thestator 12, and out of corresponding openings 242 in the pump-endendshield 30 to fix the endshields 28 and 30 and the stator 12 to oneanother.

The aforementioned ventilation structure 38 preferably includes aplurality of ribs 244 defining ventilation slots 246 therebetween. Theslots 246 are preferably provided to allow transfer of air and anyparticulate therein (e.g., water vapor) through the lead-end endshield28. Preferably, such transfer is operable to cool the motor 10.

A variety of wire-routing structure 44 is also preferably provided. Forinstance, a tab 248 defining a wiring pass-through 250 preferablyextends generally axially from the base plate 40 adjacent the outercircumferential margin 236 of the lead-end endshield 238. Wiring (notshown) may extend through the pass-through 250 as desired to connectexternal structures with components inside the electronics compartment48.

A pair of grommet-receiving recesses 252 and 254 preferably receivecorresponding pass-through grommets 256 and 258 between positioningstops 260 and 262 and enable at least substantially sealed routing ofwiring (not shown) between the electronics compartment 48 and the motorchamber 32.

Furthermore, a wiring sleeve 264 is preferably mounted to an opening 266in the lead-end endshield 28 and positioned in part by a stop 268.

Additional wire-routing structure 44 preferably includes generallyaxially projecting and arcuately or circumferentially extending walls270, 272, and 273 that are preferably disposed at least substantiallyalong an inner circumferential margin 274 of the lead-end endshield 28.Preferably, the walls 270, 272, and 273 are arcuately spaced apart. Moreparticularly, the wall 270 is preferably disposed below the terminalboard assembly 60, the wall 272 is preferably disposed below thecapacitor 56 and the support body 208 of the switch portion 202, and thewall 273 is preferably disposed adjacent the ventilation structure 38.

Furthermore, it is noted that the cover 46 might in an alternativeembodiment be provided with control mechanisms including but not limitedto rocker, toggle, and/or air switches.

Limited Access Channels and Consequent Switch Arm Protection

As will be readily understood by those of ordinary skill in the art, itis generally preferable to protect sensitive motor components frominadvertent contact by users (including fabricators, assemblers,technicians, end users, etc.) and/or their tools (e.g., wrenches,screwdrivers, wire cutters, pliers, etc.). As will be discussed ingreater detail below, the motor 10 of the present invention isparticularly designed to restrict inadvertent contact of key portions ofthe switch assembly 58 by a user when securing a pump (not shown) orother driven output device or mechanism to the motor 10.

More particularly, the shaft 206 preferably includes a lead end 276 anda pump end or drive end 278 axially opposite the lead end 276. The shaft206 preferably extends through the lead-end endshield 28 such that thelead end 276 is disposed axially outward of the outer side 28 b. Theswitch assembly 58 and especially the switch arm 210 thereof are alsopreferably disposed axially outward of the outer side 28 b. In greaterdetail still, the actuating end 212 of the switch arm 210 is preferablyadjacent (but not in contact with) the shaft lead end 276. The motor 10is designed to particularly restrict inadvertent contact of the switcharm 210 when a wrench, screwdriver, or other tool is used to hold thelead end 276 of the shaft 206 stationary as the pump or other drivenstructure is tightened onto the drive end 278. (The cover 46 willpreferably have been removed prior to such process.) As will bediscussed in greater detail below, such protective features are largelyassociated with the switch arm 210. Protection of the actuating end 212due to its near proximity to the shaft lead end 276 is of particularimportance. However, the actuator disc 220, the weights 222, and thesprings 223 are protected to at least some extent, as well.

In a broad sense, the motor 10 includes shield structure 280 thatprevents, restricts, or at least substantially prevents or restrictssuch inadvertent contact while also creating one or more predefinedaccess channels intended to enable “safe” engagement of a tool with theshaft lead end 276. For instance, from a continued broad perspective,the shield structure 280 is in part preferably disposed axially outwardof the switch actuating end 212 to at least substantially restrictdirect tool access to the actuating end 212 from an axially outwardposition relative to the switch actuating end 212. The shield structure280 also preferably at least in part defines a first tool access channel282 extending radially inwardly to the shaft lead end 276, such that theshield structure 280 enables direct tool access to the shaft lead end282 via the first tool access channel 282. Even further still, theshield structure 280 also preferably at least in part defines a secondtool access channel 284 extending radially inwardly to the shaft leadend 276, such that the shield structure 280 enables direct tool accessto the shaft lead end 282 via the second tool access channel 284.

Direct tool access as referred to herein should be understood to meanthat the necessary tool (e.g., wrench, screwdriver, etc.) can beinserted between and/or through the components 49 (and preferably intothe electronics compartment 48 defined in part by the cover 46) toreadily engage the shaft lead end 276 and be sufficiently manipulated tocause at least some degree of movement of the shaft lead end 276, asmight be required during the necessary operation (e.g., installing orremoving a pump associated with the motor 10).

As will be discussed in still greater detail below, the shield structure280 preferably comprises portions or the entireties of theaforementioned terminal board assembly 60 (including the wiring portion104; the voltage portion 106; and the capacitor portion 108,particularly the pair of capacitor support brackets 142 and 144 and theaxially extending sidewall 112 d from which the capacitor supportbrackets 142 and 144 project), the switch portion support body 208 andassociated boss 208 b, the capacitor 56 and capacitor-mounting structure42 (including the capacitor support columns 72 and 74, the capacitorboss 76, and the clamp 98), wire-routing structure 44 including thewire-routing wall 272 and the pass-through grommet 258, and thefastener-receiving posts 224 and 226 associated with mounting of thecover 46 to the lead-end endshield 28. Still further, in a broad sense,the shield structure 280 also includes portions of the base plate 40 ofthe lead-end endshield 28, the pass-through grommet 258, and ventilationstructure 38.

However, it is permissible according to some aspects of the presentinvention for additional, alternative, and/or fewer components toconstitute the shield structure. For instance, the motor might includeadditional switches (e.g., rocker, toggle, or air switches), a runcapacitor (in addition to or instead of the preferred start capacitor),electronic motor control components, a timer, one or more electricalrelays, moisture absorption devices or materials (e.g., foams ordesiccants), or other features readily apparent to one of ordinary skillin the art.

Most preferably, however, the structures constituting the shieldstructure 280 are inherently necessary to motor and/or output (e.g.,pump) operation. That is, it is preferred that components that functionsolely as shields and not in any other way associated with motor and/oroutput operation are either not present or limited. Alternativelystated, the shield structure 280 preferably comprises and mostpreferably consists essentially or entirely of so-called multi-purposecomponents that have some function beyond shielding. Such additionalfunction might be structural (e.g., support of another component),electrical (e.g., control of the motor), thermal (e.g., ventilation),etc. Such preferred dual- or multi-purpose functionality of at least oneand preferably many of the components of the shield structure 280enables efficient and cost-effective shielding by eliminating the needfor extra, dedicated shielding components (which would be associatedwith additional material and manufacturing costs, weight, etc.). It ispermissible according to some aspects of the present invention, however,for the shield structure to include one or more components that functionsolely as shields (and therefore play no other dedicated, intentionalrole in motor function or output operation).

In keeping with the above, it is particularly noted that, in a preferredembodiment, at least one of the components of the shield structure 280is an electronic component configured to at least in part control motoroperation (e.g., the capacitor 56, the terminal board assembly 60, andthe switch assembly 58). However, it is permissible according to someaspects of the present invention for the shield structure to be devoidof electronic components.

Axial and Radial Access Restrictions

In greater detail with regard to the aforementioned restriction ofdirect tool access to the switch actuating end 212 (and, more broadly,the switch arm 210) from an axially outward position relative thereto,it is preferred that the shield structure 280 includes the capacitor 56,which is preferably disposed axially outward of and in part overlappingthe switch actuating end 212 (see, for instance, FIGS. 28 and 29).Similarly, the switch body 208 and the top plate 138 of the capacitorportion 108 of the terminal board assembly 60 are disposed axiallyoutward of and in part overlapping the switch actuating end 212 and/orthe switch arm 210 in a broad sense. Thus, axially inward direct toolaccess from an axially outermost margin 48 a of the electronics chamber48 is at least substantially restricted or prevented.

With the exception of the access channels 282 and 284 described ingreater detail below, circumferential or radial access (e.g, accessradially inwardly from a radially outermost margin 48 b of theelectronics chamber 48) is also at least substantially restricted orprevented. More particularly, such access is obstructed by at least thecapacitor support columns 72 and 74, the capacitor boss 76, the supportbody bosses 208 a and 208 b, and the fastener-receiving posts 224 and226; the ribs 244 of the ventilation structure 38; the wire-routing tab248; the switch body 208 in a broad sense and in particular an outerwall 294 thereof; the circumferential or arcuate walls 270, 272, and273; and the terminal board assembly 60 in a broad sense and inparticular the sides 112 b and 120 b of the wiring portion 104 andvoltage portion 106 thereof.

It is also noted that the actuating portion 204 of the switch assembly58 (i.e., the disc 220, the weights 222, and the springs 223) are alsoprotected against inadvertent contact to some extent by the structuresdescribed above with regard to the switch arm 210 or, more particularly,the actuating end 212 thereof.

First Tool Access Channel

Preferably, as noted previously, the shield structure 280 defines afirst tool access channel 282 and a second tool access channel 284.Preferably, the second tool access channel 284 is angularly offset fromthe first tool access channel 282 by an access deviation angle α betweenabout sixty (60) degrees and about one hundred seventy-five (175)degrees. The access deviation angle α is most preferably about onehundred fifteen (115) degrees However, the access deviation angle canvary without departing from some aspects of the present invention, inaccordance with other motor design factors (e.g., a particularcontroller or wire-routing layout).

The first tool access channel 282 preferably extends generally radiallyinwardly (e.g., from the radially outermost margin 48 b of theelectronics chamber 48) to the shaft lead end 276 such that the shieldstructure 280 enables direct tool access to the shaft lead end 276 viathe first tool access channel 282. The first tool access channel 282 ispreferably disposed and oriented relative to the switch arm 210 and theactuating end 212 such that the shaft lead end 276 is at least in partdisposed between the first tool access channel 282 and the switchactuating end 212. The shaft lead end 276 thus at least substantiallyrestricts direct tool access to the switch actuating end 212 via thetool access channel 282.

With particular reference to FIGS. 12 and 28, which illustrate a wrench286 engaging the shaft lead end 276, the first tool access channel 282extends generally radially over the ventilation structure 38 and thewire-routing wall 273 to the shaft lead end 276, with the ventilationstructure 38 and the wall 273 thus at least in part defining an axiallyinner margin 282 a of the first tool access channel 282. The capacitor56 at least in part defines an axially outer margin 282 b of the firsttool access channel 282. The capacitor boss 76 and the wire-routing wall272 at least in part define a first arcuate or lateral margin 282 c ofthe first tool access channel 282. The barrier walls 198 and 200 of thebrackets 142 and 144 of the terminal board assembly 60, along with anintersection of the terminal board assembly walls 112 c and 112, atleast in part define a second arcuate or lateral margin 282 d of thefirst tool access channel 282. The lead end 276 of the shaft 206 itselfobstructs access to the switch arm 210 and, particularly, the actuatingend 212, through at least certain portions of the first tool accesschannel 282.

In summary, the first tool access channel 282 is therefore preferablycooperatively at least in part defined by the ventilation structure 38,the inner surface 70 a of the capacitor 56, the capacitor boss 76, thewire-routing walls 272 and 273, and the side 112 d and brackets 142 and144 of the terminal board assembly 60, which collaboratively prevent orat least substantially prevent an object or tool such as the illustratedwrench 286 (or screwdriver 288, as shown in FIG. 29) from deviating fromthe first tool access channel 282 when inserted therein.

As noted above, the lead end 276 of the shaft 206 itself obstructsaccess to the switch arm 210 and, particularly, the actuating end 212,through the first tool access channel 282. More particularly, in apreferred embodiment, the relative sizes and, in particular, the lateraldimensions, of the shaft lead end 276 and the actuating end 212 are suchthat substantial obstruction of access is possible. For instance, in apreferred embodiment, the actuating end 212 presents a maximum lateralactuator dimension. The shaft lead end 276 presents a minimum lateralshaft lead end dimension. The minimum lateral shaft lead end dimensionis preferably at least about fifty (50) percent of the maximum lateralactuator dimension and more preferably at least about seventy-five (75)percent of the maximum lateral actuator dimension. Most preferably, theminimum lateral shaft lead end dimension is about equal to the maximumlateral actuator dimension. However, alternative relative sizing ispermissible, provided sufficient restriction of direct tool access isnevertheless achieved.

Second Tool Access Channel

In the illustrated embodiment, the second tool access channel 284preferably extends generally radially inwardly (e.g., from the radiallyoutermost margin 48 b of the electronics chamber 48) over the grommet258 to the lead end 276 of the shaft 206. More particularly, the secondtool access channel 284 preferably extends in a first generally radialdirection. The switch arm 210 is preferably spaced radially outward ofthe shaft 206 in a second generally radial direction non-opposite thefirst generally radial direction. The second generally radial directionis angularly spaced from the first generally radial direction by anoffset angle θ such that the shield structure 280 at least substantiallyrestricts direct tool access to the switch arm 210 via the second toolaccess channel 284. That is, in a general sense, the second tool accesschannel 284 is oriented such that access to the switch arm 210therethrough is angularly prevented or at least substantiallyrestricted.

The offset angle θ is preferably between about five (5) degrees andabout one hundred thirty-five (135) degrees and more preferably betweenabout forty-five (45) degrees and about one hundred fifteen (115)degrees. Most preferably, the offset angle θ is about eighty (80)degrees.

It is noted that the second generally radial direction as discussedabove is defined based on the radially closest portion of the switch arm212 to the lead end 276. In a preferred embodiment, as illustrated, forinstance, such direction is based on the disposition of the actuator end212 relative to the lead end 276.

With particular reference to FIGS. 13 and 29, which illustrate ascrewdriver 288 engaging the lead end 276, the second tool accesschannel 284 extends generally radially over the grommet 258 and the topedge 272 a of the wire-routing wall 272, which thereby cooperatively atleast in part define an axially inner margin 284 a of the second toolaccess channel 284. The capacitor 56 (more particularly, the axiallyinner surface 70 a thereof) and an overhanging portion of the outer wall294 of the switch body 208 cooperatively at least in part define anaxially outer margin 284 b of the second tool access channel 284. Theswitch assembly boss 208 b and the wire-routing wall 272 cooperativelyat least in part define a first arcuate or lateral margin 284 c of thesecond tool access channel 284. The capacitor support bracket 72 atleast in part defines a second arcuate or lateral margin 284 d of thesecond tool access channel 284.

The wall 272 includes a cutout 290 in part defined by an edge 292 of thewall 272. The cutout 290 is designed to further assist with leadrouting. Preferably, tool access occurs axially outwardly from thecutout 290 (see for instance, the screwdriver 288 in FIG. 13), such thatthe edge 292 does not in part define the second lateral margin 284 d.

In summary, the second tool access channel 284 is therefore preferablycooperatively at least in part defined by the grommet 258, thewire-routing wall 272, the inner surface 70 a of the capacitor 56, theouter wall 294 of the switch body 208, the switch assembly boss 208 b,and the capacitor support bracket 72.

CONCLUSION

Although the above description presents features of preferredembodiments of the present invention, other preferred embodiments mayalso be created in keeping with the principles of the invention.Furthermore, these other preferred embodiments may in some instances berealized through a combination of features compatible for use togetherdespite having been presented independently in the above description.

The preferred forms of the invention described above are to be used asillustration only and should not be utilized in a limiting sense ininterpreting the scope of the present invention. Obvious modificationsto the exemplary embodiments, as hereinabove set forth, could be readilymade by those skilled in the art without departing from the spirit ofthe present invention.

The inventors hereby state their intent to rely on the Doctrine ofEquivalents to determine and assess the reasonably fair scope of thepresent invention as pertains to any apparatus not materially departingfrom but outside the literal scope of the invention.

What is claimed is:
 1. A motor comprising: a rotor rotatable about anaxis, said rotor including a shaft presenting a shaft lead end; a switchassembly operable to at least in part control an aspect of motoroperation, said switch assembly including a switch arm shiftable betweena first position and a second position; a lead-end endshield presentingopposite inner and outer endshield sides, said shaft projecting throughsaid endshield, said shaft lead end and said switch assembly beingdisposed axially outward of the outer endshield side; and shieldstructure disposed axially outward of said switch arm to at leastsubstantially restrict direct tool access to the switch arm from anaxially outward position relative to the switch arm, said shieldstructure further at least in part defining a tool access channelextending radially inwardly to the shaft lead end, such that the shieldstructure enables direct tool access to the shaft lead end via the toolaccess channel, said shaft lead end being at least in part disposedbetween said tool access channel and said switch arm, such that theshaft lead end at least substantially restricts direct tool access tothe switch arm via the tool access channel.
 2. The motor as claimed inclaim 1, further comprising: a cover removably secured relative to theendshield, said cover at least in part defining an electronicscompartment having a radially outermost margin, said electronicscompartment at least substantially receiving said switch assembly andsaid shaft lead end, said tool access channel extending from theradially outermost margin of the electronics compartment.
 3. The motoras claimed in claim 1, said shield structure including an electroniccomponent configured to control motor operation.
 4. The motor as claimedin claim 3, said shield structure at least in part including a capacitordisposed axially outward of the switch arm.
 5. The motor as claimed inclaim 4, said shield structure further at least in part including acapacitor boss to which the capacitor is at least in part secured. 6.The motor as claimed in claim 3, said shield structure at least in partincluding a terminal board assembly.
 7. The motor as claimed in claim 6,further comprising: a capacitor, said terminal board assembly includinga pair of capacitor support brackets at least in part supporting thecapacitor, said shield structure at least in part including saidcapacitor support brackets.
 8. The motor as claimed in claim 1, saidshield structure at least in part including wire-routing structure. 9.The motor as claimed in claim 8, said wire-routing structure including agenerally arcuately extending, axially projecting wire-routing wall,said shield structure at least in part including said wire-routing wall.10. The motor as claimed in claim 1, further comprising: ventilationstructure, said shield structure at least in part including saidventilation structure.
 11. The motor as claimed in claim 1, furthercomprising: a capacitor disposed axially outward of the switch arm andpresenting axially opposed inner and outer surfaces; a capacitor boss towhich the capacitor is at least in part secured; a terminal boardassembly including— a pair of capacitor support brackets at least inpart supporting the capacitor, and an axially extending sidewall fromwhich the capacitor support brackets project; wire-routing structureincluding a generally arcuately extending, axially projectingwire-routing wall; and ventilation structure, said inner surface of thecapacitor, said capacitor boss, said sidewall and capacitor supportbrackets, said wire-routing wall, and said ventilation structurecooperatively at least in part defining the tool access channel.
 12. Themotor as claimed in claim 1, said switch arm including an actuating endadjacent the shaft lead end, said actuating end presenting a maximumlateral actuating end dimension, said shaft lead end presenting aminimum lateral shaft lead end dimension, said minimum lateral shaftlead end dimension being at least about 50% of said maximum lateralactuating end dimension.
 13. The motor as claimed in claim 12, saidminimum lateral shaft lead end dimension being at least about 75% ofsaid maximum lateral actuating end dimension.
 14. The motor as claimedin claim 1, said shield structure further at least in part defining asecond tool access channel extending inwardly to the shaft lead end in afirst generally radial direction, such that the shield structure enablesdirect tool access to the shaft lead end via the tool access channel,said switch arm being spaced radially outward of the shaft in a secondgenerally radial direction non-opposite the first generally radialdirection, said second generally radial direction being angularly spacedfrom the first generally radial direction by an offset angle such thatsaid shield structure at least substantially restricts direct toolaccess to said switch arm via the tool access channel.
 15. The motor asclaimed in claim 14, further comprising: a capacitor disposed axiallyoutward of the switch arm and presenting axially opposed inner and outersurfaces; a generally axially projecting capacitor support column atleast in part supporting the capacitor; a capacitor boss to which thecapacitor is at least in part secured; a terminal board assemblyincluding— a pair of capacitor support brackets at least in partsupporting the capacitor, and an axially extending sidewall from whichthe capacitor support brackets project; wire-routing structure includinga pass-through grommet and a generally arcuately extending, axiallyprojecting wire-routing wall; ventilation structure; and a switchassembly boss at least in part supporting the switch assembly, saidinner surface of the capacitor, said capacitor boss, said sidewall andcapacitor support brackets, said wire-routing wall, and said ventilationstructure cooperatively at least in part defining the tool accesschannel, said inner surface of the capacitor, said pass-through grommet,said wire-routing wall, and said switch assembly boss cooperatively atleast in part defining the second tool access channel.
 16. The motor asclaimed in claim 14, said second tool access channel being disposedbetween about 60 degrees and about 175 degrees from said tool accesschannel.
 17. The motor as claimed in claim 16, said second tool accesschannel being disposed about 115 degrees from said tool access channel.18. A motor comprising: a rotor rotatable about an axis, said rotorincluding a shaft presenting a shaft lead end; a switch assemblyoperable to at least in part control an aspect of motor operation, saidswitch assembly including a switch arm shiftable between a firstposition and a second position; a lead-end endshield presenting oppositeinner and outer endshield sides, said shaft projecting through saidendshield, said shaft lead end and said switch assembly being disposedaxially outward of the outer endshield side; and shield structuredisposed axially outward of said switch arm to at least substantiallyrestrict direct tool access to the switch arm from an axially outwardposition relative to the switch arm, said shield structure further atleast in part defining a tool access channel extending inwardly to theshaft lead end in a first generally radial direction, such that theshield structure enables direct tool access to the shaft lead end viathe tool access channel, said switch arm being spaced radially outwardof the shaft in a second generally radial direction non-opposite thefirst generally radial direction, said second generally radial directionbeing angularly spaced from the first generally radial direction by anoffset angle such that said shield structure at least substantiallyrestricts direct tool access to said switch arm via the tool accesschannel.
 19. The motor as claimed in claim 18, said offset angle beingbetween about 5 degrees and about 135 degrees.
 20. The motor as claimedin claim 19, said offset angle being between about 45 degrees and about115 degrees.
 21. The motor as claimed in claim 20, said offset anglebeing about 80 degrees.
 22. The motor as claimed in claim 18, furthercomprising: a cover removably secured relative to the endshield, saidcover at least in part defining an electronics compartment having aradially outermost margin, said electronics compartment at leastsubstantially receiving said switch assembly and said shaft lead end,said tool access channel extending from the radially outermost margin ofthe electronics compartment.
 23. The motor as claimed in claim 18, saidshield structure including an electronic component configured to controlmotor operation.
 24. The motor as claimed in claim 23, said shieldstructure at least in part including a capacitor disposed axiallyoutward of the switch arm.
 25. The motor as claimed in claim 24, saidshield structure further at least in part including a generally axiallyprojecting capacitor support column at least in part supporting thecapacitor.
 26. The motor as claimed in claim 18, said motor including aswitch assembly boss at least in part supporting the switch assembly,said shield structure at least in part including said switch assemblyboss.
 27. The motor as claimed in claim 1, said shield structure atleast in part including wire-routing structure.
 28. The motor as claimedin claim 27, said wire-routing structure including— a pass-throughgrommet, and a generally arcuately extending, axially projectingwire-routing wall, said shield structure at least in part including saidpass-through grommet and said wire-routing wall.
 29. The motor asclaimed in claim 18, said motor including— a capacitor disposed axiallyoutward of the switch arm and presenting axially opposed inner and outersurfaces, a generally axially projecting capacitor support column atleast in part supporting the capacitor, wire-routing structure includinga pass-through grommet and a generally arcuately extending, axiallyprojecting wire-routing wall, and a switch assembly boss at least inpart supporting the switch assembly, said inner surface of thecapacitor, said pass-through grommet, said wire-routing wall, and saidswitch assembly boss cooperatively at least in part defining the toolaccess channel.